late 15c., "to lament," probably from Middle Dutch jammeren and cognate Middle English yeoumeren, "to mourn, complain," from Old English geomrian "to lament," from geomor "sorrowful," probably of imitative origin. Cognate with Old Saxon jamar "sad, sorrowful," German Jammer "lamentation, misery." Meaning "to make loud, annoying noise" is attested from 1510s. Related: Yammered; yammering.
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